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- // SPDX-License-Identifier: GPL-2.0
- /*
- * lib/locking-selftest.c
- *
- * Testsuite for various locking APIs: spinlocks, rwlocks,
- * mutexes and rw-semaphores.
- *
- * It is checking both false positives and false negatives.
- *
- * Started by Ingo Molnar:
- *
- * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <[email protected]>
- */
- #include <linux/rwsem.h>
- #include <linux/mutex.h>
- #include <linux/ww_mutex.h>
- #include <linux/sched.h>
- #include <linux/sched/mm.h>
- #include <linux/delay.h>
- #include <linux/lockdep.h>
- #include <linux/spinlock.h>
- #include <linux/kallsyms.h>
- #include <linux/interrupt.h>
- #include <linux/debug_locks.h>
- #include <linux/irqflags.h>
- #include <linux/rtmutex.h>
- #include <linux/local_lock.h>
- #ifdef CONFIG_PREEMPT_RT
- # define NON_RT(...)
- #else
- # define NON_RT(...) __VA_ARGS__
- #endif
- /*
- * Change this to 1 if you want to see the failure printouts:
- */
- static unsigned int debug_locks_verbose;
- unsigned int force_read_lock_recursive;
- static DEFINE_WD_CLASS(ww_lockdep);
- static int __init setup_debug_locks_verbose(char *str)
- {
- get_option(&str, &debug_locks_verbose);
- return 1;
- }
- __setup("debug_locks_verbose=", setup_debug_locks_verbose);
- #define FAILURE 0
- #define SUCCESS 1
- #define LOCKTYPE_SPIN 0x1
- #define LOCKTYPE_RWLOCK 0x2
- #define LOCKTYPE_MUTEX 0x4
- #define LOCKTYPE_RWSEM 0x8
- #define LOCKTYPE_WW 0x10
- #define LOCKTYPE_RTMUTEX 0x20
- #define LOCKTYPE_LL 0x40
- #define LOCKTYPE_SPECIAL 0x80
- static struct ww_acquire_ctx t, t2;
- static struct ww_mutex o, o2, o3;
- /*
- * Normal standalone locks, for the circular and irq-context
- * dependency tests:
- */
- static DEFINE_SPINLOCK(lock_A);
- static DEFINE_SPINLOCK(lock_B);
- static DEFINE_SPINLOCK(lock_C);
- static DEFINE_SPINLOCK(lock_D);
- static DEFINE_RAW_SPINLOCK(raw_lock_A);
- static DEFINE_RAW_SPINLOCK(raw_lock_B);
- static DEFINE_RWLOCK(rwlock_A);
- static DEFINE_RWLOCK(rwlock_B);
- static DEFINE_RWLOCK(rwlock_C);
- static DEFINE_RWLOCK(rwlock_D);
- static DEFINE_MUTEX(mutex_A);
- static DEFINE_MUTEX(mutex_B);
- static DEFINE_MUTEX(mutex_C);
- static DEFINE_MUTEX(mutex_D);
- static DECLARE_RWSEM(rwsem_A);
- static DECLARE_RWSEM(rwsem_B);
- static DECLARE_RWSEM(rwsem_C);
- static DECLARE_RWSEM(rwsem_D);
- #ifdef CONFIG_RT_MUTEXES
- static DEFINE_RT_MUTEX(rtmutex_A);
- static DEFINE_RT_MUTEX(rtmutex_B);
- static DEFINE_RT_MUTEX(rtmutex_C);
- static DEFINE_RT_MUTEX(rtmutex_D);
- #endif
- /*
- * Locks that we initialize dynamically as well so that
- * e.g. X1 and X2 becomes two instances of the same class,
- * but X* and Y* are different classes. We do this so that
- * we do not trigger a real lockup:
- */
- static DEFINE_SPINLOCK(lock_X1);
- static DEFINE_SPINLOCK(lock_X2);
- static DEFINE_SPINLOCK(lock_Y1);
- static DEFINE_SPINLOCK(lock_Y2);
- static DEFINE_SPINLOCK(lock_Z1);
- static DEFINE_SPINLOCK(lock_Z2);
- static DEFINE_RWLOCK(rwlock_X1);
- static DEFINE_RWLOCK(rwlock_X2);
- static DEFINE_RWLOCK(rwlock_Y1);
- static DEFINE_RWLOCK(rwlock_Y2);
- static DEFINE_RWLOCK(rwlock_Z1);
- static DEFINE_RWLOCK(rwlock_Z2);
- static DEFINE_MUTEX(mutex_X1);
- static DEFINE_MUTEX(mutex_X2);
- static DEFINE_MUTEX(mutex_Y1);
- static DEFINE_MUTEX(mutex_Y2);
- static DEFINE_MUTEX(mutex_Z1);
- static DEFINE_MUTEX(mutex_Z2);
- static DECLARE_RWSEM(rwsem_X1);
- static DECLARE_RWSEM(rwsem_X2);
- static DECLARE_RWSEM(rwsem_Y1);
- static DECLARE_RWSEM(rwsem_Y2);
- static DECLARE_RWSEM(rwsem_Z1);
- static DECLARE_RWSEM(rwsem_Z2);
- #ifdef CONFIG_RT_MUTEXES
- static DEFINE_RT_MUTEX(rtmutex_X1);
- static DEFINE_RT_MUTEX(rtmutex_X2);
- static DEFINE_RT_MUTEX(rtmutex_Y1);
- static DEFINE_RT_MUTEX(rtmutex_Y2);
- static DEFINE_RT_MUTEX(rtmutex_Z1);
- static DEFINE_RT_MUTEX(rtmutex_Z2);
- #endif
- static DEFINE_PER_CPU(local_lock_t, local_A);
- /*
- * non-inlined runtime initializers, to let separate locks share
- * the same lock-class:
- */
- #define INIT_CLASS_FUNC(class) \
- static noinline void \
- init_class_##class(spinlock_t *lock, rwlock_t *rwlock, \
- struct mutex *mutex, struct rw_semaphore *rwsem)\
- { \
- spin_lock_init(lock); \
- rwlock_init(rwlock); \
- mutex_init(mutex); \
- init_rwsem(rwsem); \
- }
- INIT_CLASS_FUNC(X)
- INIT_CLASS_FUNC(Y)
- INIT_CLASS_FUNC(Z)
- static void init_shared_classes(void)
- {
- #ifdef CONFIG_RT_MUTEXES
- static struct lock_class_key rt_X, rt_Y, rt_Z;
- __rt_mutex_init(&rtmutex_X1, __func__, &rt_X);
- __rt_mutex_init(&rtmutex_X2, __func__, &rt_X);
- __rt_mutex_init(&rtmutex_Y1, __func__, &rt_Y);
- __rt_mutex_init(&rtmutex_Y2, __func__, &rt_Y);
- __rt_mutex_init(&rtmutex_Z1, __func__, &rt_Z);
- __rt_mutex_init(&rtmutex_Z2, __func__, &rt_Z);
- #endif
- init_class_X(&lock_X1, &rwlock_X1, &mutex_X1, &rwsem_X1);
- init_class_X(&lock_X2, &rwlock_X2, &mutex_X2, &rwsem_X2);
- init_class_Y(&lock_Y1, &rwlock_Y1, &mutex_Y1, &rwsem_Y1);
- init_class_Y(&lock_Y2, &rwlock_Y2, &mutex_Y2, &rwsem_Y2);
- init_class_Z(&lock_Z1, &rwlock_Z1, &mutex_Z1, &rwsem_Z1);
- init_class_Z(&lock_Z2, &rwlock_Z2, &mutex_Z2, &rwsem_Z2);
- }
- /*
- * For spinlocks and rwlocks we also do hardirq-safe / softirq-safe tests.
- * The following functions use a lock from a simulated hardirq/softirq
- * context, causing the locks to be marked as hardirq-safe/softirq-safe:
- */
- #define HARDIRQ_DISABLE local_irq_disable
- #define HARDIRQ_ENABLE local_irq_enable
- #define HARDIRQ_ENTER() \
- local_irq_disable(); \
- __irq_enter(); \
- lockdep_hardirq_threaded(); \
- WARN_ON(!in_irq());
- #define HARDIRQ_EXIT() \
- __irq_exit(); \
- local_irq_enable();
- #define SOFTIRQ_DISABLE local_bh_disable
- #define SOFTIRQ_ENABLE local_bh_enable
- #define SOFTIRQ_ENTER() \
- local_bh_disable(); \
- local_irq_disable(); \
- lockdep_softirq_enter(); \
- WARN_ON(!in_softirq());
- #define SOFTIRQ_EXIT() \
- lockdep_softirq_exit(); \
- local_irq_enable(); \
- local_bh_enable();
- /*
- * Shortcuts for lock/unlock API variants, to keep
- * the testcases compact:
- */
- #define L(x) spin_lock(&lock_##x)
- #define U(x) spin_unlock(&lock_##x)
- #define LU(x) L(x); U(x)
- #define SI(x) spin_lock_init(&lock_##x)
- #define WL(x) write_lock(&rwlock_##x)
- #define WU(x) write_unlock(&rwlock_##x)
- #define WLU(x) WL(x); WU(x)
- #define RL(x) read_lock(&rwlock_##x)
- #define RU(x) read_unlock(&rwlock_##x)
- #define RLU(x) RL(x); RU(x)
- #define RWI(x) rwlock_init(&rwlock_##x)
- #define ML(x) mutex_lock(&mutex_##x)
- #define MU(x) mutex_unlock(&mutex_##x)
- #define MI(x) mutex_init(&mutex_##x)
- #define RTL(x) rt_mutex_lock(&rtmutex_##x)
- #define RTU(x) rt_mutex_unlock(&rtmutex_##x)
- #define RTI(x) rt_mutex_init(&rtmutex_##x)
- #define WSL(x) down_write(&rwsem_##x)
- #define WSU(x) up_write(&rwsem_##x)
- #define RSL(x) down_read(&rwsem_##x)
- #define RSU(x) up_read(&rwsem_##x)
- #define RWSI(x) init_rwsem(&rwsem_##x)
- #ifndef CONFIG_DEBUG_WW_MUTEX_SLOWPATH
- #define WWAI(x) ww_acquire_init(x, &ww_lockdep)
- #else
- #define WWAI(x) do { ww_acquire_init(x, &ww_lockdep); (x)->deadlock_inject_countdown = ~0U; } while (0)
- #endif
- #define WWAD(x) ww_acquire_done(x)
- #define WWAF(x) ww_acquire_fini(x)
- #define WWL(x, c) ww_mutex_lock(x, c)
- #define WWT(x) ww_mutex_trylock(x, NULL)
- #define WWL1(x) ww_mutex_lock(x, NULL)
- #define WWU(x) ww_mutex_unlock(x)
- #define LOCK_UNLOCK_2(x,y) LOCK(x); LOCK(y); UNLOCK(y); UNLOCK(x)
- /*
- * Generate different permutations of the same testcase, using
- * the same basic lock-dependency/state events:
- */
- #define GENERATE_TESTCASE(name) \
- \
- static void name(void) { E(); }
- #define GENERATE_PERMUTATIONS_2_EVENTS(name) \
- \
- static void name##_12(void) { E1(); E2(); } \
- static void name##_21(void) { E2(); E1(); }
- #define GENERATE_PERMUTATIONS_3_EVENTS(name) \
- \
- static void name##_123(void) { E1(); E2(); E3(); } \
- static void name##_132(void) { E1(); E3(); E2(); } \
- static void name##_213(void) { E2(); E1(); E3(); } \
- static void name##_231(void) { E2(); E3(); E1(); } \
- static void name##_312(void) { E3(); E1(); E2(); } \
- static void name##_321(void) { E3(); E2(); E1(); }
- /*
- * AA deadlock:
- */
- #define E() \
- \
- LOCK(X1); \
- LOCK(X2); /* this one should fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(AA_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(AA_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(AA_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(AA_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(AA_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(AA_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(AA_rtmutex);
- #endif
- #undef E
- /*
- * Special-case for read-locking, they are
- * allowed to recurse on the same lock class:
- */
- static void rlock_AA1(void)
- {
- RL(X1);
- RL(X1); // this one should NOT fail
- }
- static void rlock_AA1B(void)
- {
- RL(X1);
- RL(X2); // this one should NOT fail
- }
- static void rsem_AA1(void)
- {
- RSL(X1);
- RSL(X1); // this one should fail
- }
- static void rsem_AA1B(void)
- {
- RSL(X1);
- RSL(X2); // this one should fail
- }
- /*
- * The mixing of read and write locks is not allowed:
- */
- static void rlock_AA2(void)
- {
- RL(X1);
- WL(X2); // this one should fail
- }
- static void rsem_AA2(void)
- {
- RSL(X1);
- WSL(X2); // this one should fail
- }
- static void rlock_AA3(void)
- {
- WL(X1);
- RL(X2); // this one should fail
- }
- static void rsem_AA3(void)
- {
- WSL(X1);
- RSL(X2); // this one should fail
- }
- /*
- * read_lock(A)
- * spin_lock(B)
- * spin_lock(B)
- * write_lock(A)
- */
- static void rlock_ABBA1(void)
- {
- RL(X1);
- L(Y1);
- U(Y1);
- RU(X1);
- L(Y1);
- WL(X1);
- WU(X1);
- U(Y1); // should fail
- }
- static void rwsem_ABBA1(void)
- {
- RSL(X1);
- ML(Y1);
- MU(Y1);
- RSU(X1);
- ML(Y1);
- WSL(X1);
- WSU(X1);
- MU(Y1); // should fail
- }
- /*
- * read_lock(A)
- * spin_lock(B)
- * spin_lock(B)
- * write_lock(A)
- *
- * This test case is aimed at poking whether the chain cache prevents us from
- * detecting a read-lock/lock-write deadlock: if the chain cache doesn't differ
- * read/write locks, the following case may happen
- *
- * { read_lock(A)->lock(B) dependency exists }
- *
- * P0:
- * lock(B);
- * read_lock(A);
- *
- * { Not a deadlock, B -> A is added in the chain cache }
- *
- * P1:
- * lock(B);
- * write_lock(A);
- *
- * { B->A found in chain cache, not reported as a deadlock }
- *
- */
- static void rlock_chaincache_ABBA1(void)
- {
- RL(X1);
- L(Y1);
- U(Y1);
- RU(X1);
- L(Y1);
- RL(X1);
- RU(X1);
- U(Y1);
- L(Y1);
- WL(X1);
- WU(X1);
- U(Y1); // should fail
- }
- /*
- * read_lock(A)
- * spin_lock(B)
- * spin_lock(B)
- * read_lock(A)
- */
- static void rlock_ABBA2(void)
- {
- RL(X1);
- L(Y1);
- U(Y1);
- RU(X1);
- L(Y1);
- RL(X1);
- RU(X1);
- U(Y1); // should NOT fail
- }
- static void rwsem_ABBA2(void)
- {
- RSL(X1);
- ML(Y1);
- MU(Y1);
- RSU(X1);
- ML(Y1);
- RSL(X1);
- RSU(X1);
- MU(Y1); // should fail
- }
- /*
- * write_lock(A)
- * spin_lock(B)
- * spin_lock(B)
- * write_lock(A)
- */
- static void rlock_ABBA3(void)
- {
- WL(X1);
- L(Y1);
- U(Y1);
- WU(X1);
- L(Y1);
- WL(X1);
- WU(X1);
- U(Y1); // should fail
- }
- static void rwsem_ABBA3(void)
- {
- WSL(X1);
- ML(Y1);
- MU(Y1);
- WSU(X1);
- ML(Y1);
- WSL(X1);
- WSU(X1);
- MU(Y1); // should fail
- }
- /*
- * ABBA deadlock:
- */
- #define E() \
- \
- LOCK_UNLOCK_2(A, B); \
- LOCK_UNLOCK_2(B, A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(ABBA_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(ABBA_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(ABBA_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(ABBA_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(ABBA_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(ABBA_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(ABBA_rtmutex);
- #endif
- #undef E
- /*
- * AB BC CA deadlock:
- */
- #define E() \
- \
- LOCK_UNLOCK_2(A, B); \
- LOCK_UNLOCK_2(B, C); \
- LOCK_UNLOCK_2(C, A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(ABBCCA_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(ABBCCA_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(ABBCCA_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(ABBCCA_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(ABBCCA_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(ABBCCA_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(ABBCCA_rtmutex);
- #endif
- #undef E
- /*
- * AB CA BC deadlock:
- */
- #define E() \
- \
- LOCK_UNLOCK_2(A, B); \
- LOCK_UNLOCK_2(C, A); \
- LOCK_UNLOCK_2(B, C); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(ABCABC_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(ABCABC_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(ABCABC_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(ABCABC_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(ABCABC_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(ABCABC_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(ABCABC_rtmutex);
- #endif
- #undef E
- /*
- * AB BC CD DA deadlock:
- */
- #define E() \
- \
- LOCK_UNLOCK_2(A, B); \
- LOCK_UNLOCK_2(B, C); \
- LOCK_UNLOCK_2(C, D); \
- LOCK_UNLOCK_2(D, A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(ABBCCDDA_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(ABBCCDDA_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(ABBCCDDA_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(ABBCCDDA_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(ABBCCDDA_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(ABBCCDDA_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(ABBCCDDA_rtmutex);
- #endif
- #undef E
- /*
- * AB CD BD DA deadlock:
- */
- #define E() \
- \
- LOCK_UNLOCK_2(A, B); \
- LOCK_UNLOCK_2(C, D); \
- LOCK_UNLOCK_2(B, D); \
- LOCK_UNLOCK_2(D, A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(ABCDBDDA_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(ABCDBDDA_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(ABCDBDDA_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(ABCDBDDA_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(ABCDBDDA_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(ABCDBDDA_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(ABCDBDDA_rtmutex);
- #endif
- #undef E
- /*
- * AB CD BC DA deadlock:
- */
- #define E() \
- \
- LOCK_UNLOCK_2(A, B); \
- LOCK_UNLOCK_2(C, D); \
- LOCK_UNLOCK_2(B, C); \
- LOCK_UNLOCK_2(D, A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(ABCDBCDA_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(ABCDBCDA_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(ABCDBCDA_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(ABCDBCDA_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(ABCDBCDA_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(ABCDBCDA_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(ABCDBCDA_rtmutex);
- #endif
- #undef E
- #ifdef CONFIG_PREEMPT_RT
- # define RT_PREPARE_DBL_UNLOCK() { migrate_disable(); rcu_read_lock(); }
- #else
- # define RT_PREPARE_DBL_UNLOCK()
- #endif
- /*
- * Double unlock:
- */
- #define E() \
- \
- LOCK(A); \
- RT_PREPARE_DBL_UNLOCK(); \
- UNLOCK(A); \
- UNLOCK(A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(double_unlock_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(double_unlock_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(double_unlock_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(double_unlock_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(double_unlock_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(double_unlock_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(double_unlock_rtmutex);
- #endif
- #undef E
- /*
- * initializing a held lock:
- */
- #define E() \
- \
- LOCK(A); \
- INIT(A); /* fail */
- /*
- * 6 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_TESTCASE(init_held_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_TESTCASE(init_held_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_TESTCASE(init_held_rlock)
- #include "locking-selftest-mutex.h"
- GENERATE_TESTCASE(init_held_mutex)
- #include "locking-selftest-wsem.h"
- GENERATE_TESTCASE(init_held_wsem)
- #include "locking-selftest-rsem.h"
- GENERATE_TESTCASE(init_held_rsem)
- #ifdef CONFIG_RT_MUTEXES
- #include "locking-selftest-rtmutex.h"
- GENERATE_TESTCASE(init_held_rtmutex);
- #endif
- #undef E
- /*
- * locking an irq-safe lock with irqs enabled:
- */
- #define E1() \
- \
- IRQ_ENTER(); \
- LOCK(A); \
- UNLOCK(A); \
- IRQ_EXIT();
- #define E2() \
- \
- LOCK(A); \
- UNLOCK(A);
- /*
- * Generate 24 testcases:
- */
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_spin)
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_rlock)
- #include "locking-selftest-wlock-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-spin-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_spin)
- #include "locking-selftest-rlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_rlock)
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe1_soft_wlock)
- #endif
- #undef E1
- #undef E2
- #ifndef CONFIG_PREEMPT_RT
- /*
- * Enabling hardirqs with a softirq-safe lock held:
- */
- #define E1() \
- \
- SOFTIRQ_ENTER(); \
- LOCK(A); \
- UNLOCK(A); \
- SOFTIRQ_EXIT();
- #define E2() \
- \
- HARDIRQ_DISABLE(); \
- LOCK(A); \
- HARDIRQ_ENABLE(); \
- UNLOCK(A);
- /*
- * Generate 12 testcases:
- */
- #include "locking-selftest-spin.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_spin)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_wlock)
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2A_rlock)
- #undef E1
- #undef E2
- #endif
- /*
- * Enabling irqs with an irq-safe lock held:
- */
- #define E1() \
- \
- IRQ_ENTER(); \
- LOCK(A); \
- UNLOCK(A); \
- IRQ_EXIT();
- #define E2() \
- \
- IRQ_DISABLE(); \
- LOCK(A); \
- IRQ_ENABLE(); \
- UNLOCK(A);
- /*
- * Generate 24 testcases:
- */
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_spin)
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_rlock)
- #include "locking-selftest-wlock-hardirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-spin-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_spin)
- #include "locking-selftest-rlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_rlock)
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_2_EVENTS(irqsafe2B_soft_wlock)
- #endif
- #undef E1
- #undef E2
- /*
- * Acquiring a irq-unsafe lock while holding an irq-safe-lock:
- */
- #define E1() \
- \
- LOCK(A); \
- LOCK(B); \
- UNLOCK(B); \
- UNLOCK(A); \
- #define E2() \
- \
- LOCK(B); \
- UNLOCK(B);
- #define E3() \
- \
- IRQ_ENTER(); \
- LOCK(A); \
- UNLOCK(A); \
- IRQ_EXIT();
- /*
- * Generate 36 testcases:
- */
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_spin)
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_rlock)
- #include "locking-selftest-wlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-spin-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_spin)
- #include "locking-selftest-rlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_rlock)
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe3_soft_wlock)
- #endif
- #undef E1
- #undef E2
- #undef E3
- /*
- * If a lock turns into softirq-safe, but earlier it took
- * a softirq-unsafe lock:
- */
- #define E1() \
- IRQ_DISABLE(); \
- LOCK(A); \
- LOCK(B); \
- UNLOCK(B); \
- UNLOCK(A); \
- IRQ_ENABLE();
- #define E2() \
- LOCK(B); \
- UNLOCK(B);
- #define E3() \
- IRQ_ENTER(); \
- LOCK(A); \
- UNLOCK(A); \
- IRQ_EXIT();
- /*
- * Generate 36 testcases:
- */
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_spin)
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_rlock)
- #include "locking-selftest-wlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-spin-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_spin)
- #include "locking-selftest-rlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_rlock)
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irqsafe4_soft_wlock)
- #endif
- #undef E1
- #undef E2
- #undef E3
- /*
- * read-lock / write-lock irq inversion.
- *
- * Deadlock scenario:
- *
- * CPU#1 is at #1, i.e. it has write-locked A, but has not
- * taken B yet.
- *
- * CPU#2 is at #2, i.e. it has locked B.
- *
- * Hardirq hits CPU#2 at point #2 and is trying to read-lock A.
- *
- * The deadlock occurs because CPU#1 will spin on B, and CPU#2
- * will spin on A.
- */
- #define E1() \
- \
- IRQ_DISABLE(); \
- WL(A); \
- LOCK(B); \
- UNLOCK(B); \
- WU(A); \
- IRQ_ENABLE();
- #define E2() \
- \
- LOCK(B); \
- UNLOCK(B);
- #define E3() \
- \
- IRQ_ENTER(); \
- RL(A); \
- RU(A); \
- IRQ_EXIT();
- /*
- * Generate 36 testcases:
- */
- #include "locking-selftest-spin-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_spin)
- #include "locking-selftest-rlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_rlock)
- #include "locking-selftest-wlock-hardirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-spin-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_spin)
- #include "locking-selftest-rlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_rlock)
- #include "locking-selftest-wlock-softirq.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_inversion_soft_wlock)
- #endif
- #undef E1
- #undef E2
- #undef E3
- /*
- * write-read / write-read / write-read deadlock even if read is recursive
- */
- #define E1() \
- \
- WL(X1); \
- RL(Y1); \
- RU(Y1); \
- WU(X1);
- #define E2() \
- \
- WL(Y1); \
- RL(Z1); \
- RU(Z1); \
- WU(Y1);
- #define E3() \
- \
- WL(Z1); \
- RL(X1); \
- RU(X1); \
- WU(Z1);
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(W1R2_W2R3_W3R1)
- #undef E1
- #undef E2
- #undef E3
- /*
- * write-write / read-read / write-read deadlock even if read is recursive
- */
- #define E1() \
- \
- WL(X1); \
- WL(Y1); \
- WU(Y1); \
- WU(X1);
- #define E2() \
- \
- RL(Y1); \
- RL(Z1); \
- RU(Z1); \
- RU(Y1);
- #define E3() \
- \
- WL(Z1); \
- RL(X1); \
- RU(X1); \
- WU(Z1);
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_W3R1)
- #undef E1
- #undef E2
- #undef E3
- /*
- * write-write / read-read / read-write is not deadlock when read is recursive
- */
- #define E1() \
- \
- WL(X1); \
- WL(Y1); \
- WU(Y1); \
- WU(X1);
- #define E2() \
- \
- RL(Y1); \
- RL(Z1); \
- RU(Z1); \
- RU(Y1);
- #define E3() \
- \
- RL(Z1); \
- WL(X1); \
- WU(X1); \
- RU(Z1);
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(W1R2_R2R3_W3W1)
- #undef E1
- #undef E2
- #undef E3
- /*
- * write-read / read-read / write-write is not deadlock when read is recursive
- */
- #define E1() \
- \
- WL(X1); \
- RL(Y1); \
- RU(Y1); \
- WU(X1);
- #define E2() \
- \
- RL(Y1); \
- RL(Z1); \
- RU(Z1); \
- RU(Y1);
- #define E3() \
- \
- WL(Z1); \
- WL(X1); \
- WU(X1); \
- WU(Z1);
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(W1W2_R2R3_R3W1)
- #undef E1
- #undef E2
- #undef E3
- /*
- * read-lock / write-lock recursion that is actually safe.
- */
- #define E1() \
- \
- IRQ_DISABLE(); \
- WL(A); \
- WU(A); \
- IRQ_ENABLE();
- #define E2() \
- \
- RL(A); \
- RU(A); \
- #define E3() \
- \
- IRQ_ENTER(); \
- LOCK(A); \
- L(B); \
- U(B); \
- UNLOCK(A); \
- IRQ_EXIT();
- /*
- * Generate 24 testcases:
- */
- #include "locking-selftest-hardirq.h"
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_rlock)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-softirq.h"
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_rlock)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion_soft_wlock)
- #endif
- #undef E1
- #undef E2
- #undef E3
- /*
- * read-lock / write-lock recursion that is unsafe.
- */
- #define E1() \
- \
- IRQ_DISABLE(); \
- L(B); \
- LOCK(A); \
- UNLOCK(A); \
- U(B); \
- IRQ_ENABLE();
- #define E2() \
- \
- RL(A); \
- RU(A); \
- #define E3() \
- \
- IRQ_ENTER(); \
- L(B); \
- U(B); \
- IRQ_EXIT();
- /*
- * Generate 24 testcases:
- */
- #include "locking-selftest-hardirq.h"
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_rlock)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-softirq.h"
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_rlock)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion2_soft_wlock)
- #endif
- #undef E1
- #undef E2
- #undef E3
- /*
- * read-lock / write-lock recursion that is unsafe.
- *
- * A is a ENABLED_*_READ lock
- * B is a USED_IN_*_READ lock
- *
- * read_lock(A);
- * write_lock(B);
- * <interrupt>
- * read_lock(B);
- * write_lock(A); // if this one is read_lock(), no deadlock
- */
- #define E1() \
- \
- IRQ_DISABLE(); \
- WL(B); \
- LOCK(A); \
- UNLOCK(A); \
- WU(B); \
- IRQ_ENABLE();
- #define E2() \
- \
- RL(A); \
- RU(A); \
- #define E3() \
- \
- IRQ_ENTER(); \
- RL(B); \
- RU(B); \
- IRQ_EXIT();
- /*
- * Generate 24 testcases:
- */
- #include "locking-selftest-hardirq.h"
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_rlock)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_hard_wlock)
- #ifndef CONFIG_PREEMPT_RT
- #include "locking-selftest-softirq.h"
- #include "locking-selftest-rlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_rlock)
- #include "locking-selftest-wlock.h"
- GENERATE_PERMUTATIONS_3_EVENTS(irq_read_recursion3_soft_wlock)
- #endif
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- # define I_SPINLOCK(x) lockdep_reset_lock(&lock_##x.dep_map)
- # define I_RAW_SPINLOCK(x) lockdep_reset_lock(&raw_lock_##x.dep_map)
- # define I_RWLOCK(x) lockdep_reset_lock(&rwlock_##x.dep_map)
- # define I_MUTEX(x) lockdep_reset_lock(&mutex_##x.dep_map)
- # define I_RWSEM(x) lockdep_reset_lock(&rwsem_##x.dep_map)
- # define I_WW(x) lockdep_reset_lock(&x.dep_map)
- # define I_LOCAL_LOCK(x) lockdep_reset_lock(this_cpu_ptr(&local_##x.dep_map))
- #ifdef CONFIG_RT_MUTEXES
- # define I_RTMUTEX(x) lockdep_reset_lock(&rtmutex_##x.dep_map)
- #endif
- #else
- # define I_SPINLOCK(x)
- # define I_RAW_SPINLOCK(x)
- # define I_RWLOCK(x)
- # define I_MUTEX(x)
- # define I_RWSEM(x)
- # define I_WW(x)
- # define I_LOCAL_LOCK(x)
- #endif
- #ifndef I_RTMUTEX
- # define I_RTMUTEX(x)
- #endif
- #ifdef CONFIG_RT_MUTEXES
- #define I2_RTMUTEX(x) rt_mutex_init(&rtmutex_##x)
- #else
- #define I2_RTMUTEX(x)
- #endif
- #define I1(x) \
- do { \
- I_SPINLOCK(x); \
- I_RWLOCK(x); \
- I_MUTEX(x); \
- I_RWSEM(x); \
- I_RTMUTEX(x); \
- } while (0)
- #define I2(x) \
- do { \
- spin_lock_init(&lock_##x); \
- rwlock_init(&rwlock_##x); \
- mutex_init(&mutex_##x); \
- init_rwsem(&rwsem_##x); \
- I2_RTMUTEX(x); \
- } while (0)
- static void reset_locks(void)
- {
- local_irq_disable();
- lockdep_free_key_range(&ww_lockdep.acquire_key, 1);
- lockdep_free_key_range(&ww_lockdep.mutex_key, 1);
- I1(A); I1(B); I1(C); I1(D);
- I1(X1); I1(X2); I1(Y1); I1(Y2); I1(Z1); I1(Z2);
- I_WW(t); I_WW(t2); I_WW(o.base); I_WW(o2.base); I_WW(o3.base);
- I_RAW_SPINLOCK(A); I_RAW_SPINLOCK(B);
- I_LOCAL_LOCK(A);
- lockdep_reset();
- I2(A); I2(B); I2(C); I2(D);
- init_shared_classes();
- raw_spin_lock_init(&raw_lock_A);
- raw_spin_lock_init(&raw_lock_B);
- local_lock_init(this_cpu_ptr(&local_A));
- ww_mutex_init(&o, &ww_lockdep); ww_mutex_init(&o2, &ww_lockdep); ww_mutex_init(&o3, &ww_lockdep);
- memset(&t, 0, sizeof(t)); memset(&t2, 0, sizeof(t2));
- memset(&ww_lockdep.acquire_key, 0, sizeof(ww_lockdep.acquire_key));
- memset(&ww_lockdep.mutex_key, 0, sizeof(ww_lockdep.mutex_key));
- local_irq_enable();
- }
- #undef I
- static int testcase_total;
- static int testcase_successes;
- static int expected_testcase_failures;
- static int unexpected_testcase_failures;
- static void dotest(void (*testcase_fn)(void), int expected, int lockclass_mask)
- {
- int saved_preempt_count = preempt_count();
- #ifdef CONFIG_PREEMPT_RT
- #ifdef CONFIG_SMP
- int saved_mgd_count = current->migration_disabled;
- #endif
- int saved_rcu_count = current->rcu_read_lock_nesting;
- #endif
- WARN_ON(irqs_disabled());
- debug_locks_silent = !(debug_locks_verbose & lockclass_mask);
- testcase_fn();
- /*
- * Filter out expected failures:
- */
- #ifndef CONFIG_PROVE_LOCKING
- if (expected == FAILURE && debug_locks) {
- expected_testcase_failures++;
- pr_cont("failed|");
- }
- else
- #endif
- if (debug_locks != expected) {
- unexpected_testcase_failures++;
- pr_cont("FAILED|");
- } else {
- testcase_successes++;
- pr_cont(" ok |");
- }
- testcase_total++;
- if (debug_locks_verbose & lockclass_mask)
- pr_cont(" lockclass mask: %x, debug_locks: %d, expected: %d\n",
- lockclass_mask, debug_locks, expected);
- /*
- * Some tests (e.g. double-unlock) might corrupt the preemption
- * count, so restore it:
- */
- preempt_count_set(saved_preempt_count);
- #ifdef CONFIG_PREEMPT_RT
- #ifdef CONFIG_SMP
- while (current->migration_disabled > saved_mgd_count)
- migrate_enable();
- #endif
- while (current->rcu_read_lock_nesting > saved_rcu_count)
- rcu_read_unlock();
- WARN_ON_ONCE(current->rcu_read_lock_nesting < saved_rcu_count);
- #endif
- #ifdef CONFIG_TRACE_IRQFLAGS
- if (softirq_count())
- current->softirqs_enabled = 0;
- else
- current->softirqs_enabled = 1;
- #endif
- reset_locks();
- }
- #ifdef CONFIG_RT_MUTEXES
- #define dotest_rt(fn, e, m) dotest((fn), (e), (m))
- #else
- #define dotest_rt(fn, e, m)
- #endif
- static inline void print_testname(const char *testname)
- {
- printk("%33s:", testname);
- }
- #define DO_TESTCASE_1(desc, name, nr) \
- print_testname(desc"/"#nr); \
- dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_1B(desc, name, nr) \
- print_testname(desc"/"#nr); \
- dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_1RR(desc, name, nr) \
- print_testname(desc"/"#nr); \
- pr_cont(" |"); \
- dotest(name##_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_1RRB(desc, name, nr) \
- print_testname(desc"/"#nr); \
- pr_cont(" |"); \
- dotest(name##_##nr, FAILURE, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_3(desc, name, nr) \
- print_testname(desc"/"#nr); \
- dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN); \
- dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
- dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_3RW(desc, name, nr) \
- print_testname(desc"/"#nr); \
- dotest(name##_spin_##nr, FAILURE, LOCKTYPE_SPIN|LOCKTYPE_RWLOCK);\
- dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
- dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_2RW(desc, name, nr) \
- print_testname(desc"/"#nr); \
- pr_cont(" |"); \
- dotest(name##_wlock_##nr, FAILURE, LOCKTYPE_RWLOCK); \
- dotest(name##_rlock_##nr, SUCCESS, LOCKTYPE_RWLOCK); \
- pr_cont("\n");
- #define DO_TESTCASE_2x2RW(desc, name, nr) \
- DO_TESTCASE_2RW("hard-"desc, name##_hard, nr) \
- NON_RT(DO_TESTCASE_2RW("soft-"desc, name##_soft, nr)) \
- #define DO_TESTCASE_6x2x2RW(desc, name) \
- DO_TESTCASE_2x2RW(desc, name, 123); \
- DO_TESTCASE_2x2RW(desc, name, 132); \
- DO_TESTCASE_2x2RW(desc, name, 213); \
- DO_TESTCASE_2x2RW(desc, name, 231); \
- DO_TESTCASE_2x2RW(desc, name, 312); \
- DO_TESTCASE_2x2RW(desc, name, 321);
- #define DO_TESTCASE_6(desc, name) \
- print_testname(desc); \
- dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
- dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
- dotest(name##_rlock, FAILURE, LOCKTYPE_RWLOCK); \
- dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
- dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
- dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
- dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
- pr_cont("\n");
- #define DO_TESTCASE_6_SUCCESS(desc, name) \
- print_testname(desc); \
- dotest(name##_spin, SUCCESS, LOCKTYPE_SPIN); \
- dotest(name##_wlock, SUCCESS, LOCKTYPE_RWLOCK); \
- dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
- dotest(name##_mutex, SUCCESS, LOCKTYPE_MUTEX); \
- dotest(name##_wsem, SUCCESS, LOCKTYPE_RWSEM); \
- dotest(name##_rsem, SUCCESS, LOCKTYPE_RWSEM); \
- dotest_rt(name##_rtmutex, SUCCESS, LOCKTYPE_RTMUTEX); \
- pr_cont("\n");
- /*
- * 'read' variant: rlocks must not trigger.
- */
- #define DO_TESTCASE_6R(desc, name) \
- print_testname(desc); \
- dotest(name##_spin, FAILURE, LOCKTYPE_SPIN); \
- dotest(name##_wlock, FAILURE, LOCKTYPE_RWLOCK); \
- dotest(name##_rlock, SUCCESS, LOCKTYPE_RWLOCK); \
- dotest(name##_mutex, FAILURE, LOCKTYPE_MUTEX); \
- dotest(name##_wsem, FAILURE, LOCKTYPE_RWSEM); \
- dotest(name##_rsem, FAILURE, LOCKTYPE_RWSEM); \
- dotest_rt(name##_rtmutex, FAILURE, LOCKTYPE_RTMUTEX); \
- pr_cont("\n");
- #define DO_TESTCASE_2I(desc, name, nr) \
- DO_TESTCASE_1("hard-"desc, name##_hard, nr); \
- NON_RT(DO_TESTCASE_1("soft-"desc, name##_soft, nr));
- #define DO_TESTCASE_2IB(desc, name, nr) \
- DO_TESTCASE_1B("hard-"desc, name##_hard, nr); \
- NON_RT(DO_TESTCASE_1B("soft-"desc, name##_soft, nr));
- #define DO_TESTCASE_6I(desc, name, nr) \
- DO_TESTCASE_3("hard-"desc, name##_hard, nr); \
- NON_RT(DO_TESTCASE_3("soft-"desc, name##_soft, nr));
- #define DO_TESTCASE_6IRW(desc, name, nr) \
- DO_TESTCASE_3RW("hard-"desc, name##_hard, nr); \
- NON_RT(DO_TESTCASE_3RW("soft-"desc, name##_soft, nr));
- #define DO_TESTCASE_2x3(desc, name) \
- DO_TESTCASE_3(desc, name, 12); \
- DO_TESTCASE_3(desc, name, 21);
- #define DO_TESTCASE_2x6(desc, name) \
- DO_TESTCASE_6I(desc, name, 12); \
- DO_TESTCASE_6I(desc, name, 21);
- #define DO_TESTCASE_6x2(desc, name) \
- DO_TESTCASE_2I(desc, name, 123); \
- DO_TESTCASE_2I(desc, name, 132); \
- DO_TESTCASE_2I(desc, name, 213); \
- DO_TESTCASE_2I(desc, name, 231); \
- DO_TESTCASE_2I(desc, name, 312); \
- DO_TESTCASE_2I(desc, name, 321);
- #define DO_TESTCASE_6x2B(desc, name) \
- DO_TESTCASE_2IB(desc, name, 123); \
- DO_TESTCASE_2IB(desc, name, 132); \
- DO_TESTCASE_2IB(desc, name, 213); \
- DO_TESTCASE_2IB(desc, name, 231); \
- DO_TESTCASE_2IB(desc, name, 312); \
- DO_TESTCASE_2IB(desc, name, 321);
- #define DO_TESTCASE_6x1RR(desc, name) \
- DO_TESTCASE_1RR(desc, name, 123); \
- DO_TESTCASE_1RR(desc, name, 132); \
- DO_TESTCASE_1RR(desc, name, 213); \
- DO_TESTCASE_1RR(desc, name, 231); \
- DO_TESTCASE_1RR(desc, name, 312); \
- DO_TESTCASE_1RR(desc, name, 321);
- #define DO_TESTCASE_6x1RRB(desc, name) \
- DO_TESTCASE_1RRB(desc, name, 123); \
- DO_TESTCASE_1RRB(desc, name, 132); \
- DO_TESTCASE_1RRB(desc, name, 213); \
- DO_TESTCASE_1RRB(desc, name, 231); \
- DO_TESTCASE_1RRB(desc, name, 312); \
- DO_TESTCASE_1RRB(desc, name, 321);
- #define DO_TESTCASE_6x6(desc, name) \
- DO_TESTCASE_6I(desc, name, 123); \
- DO_TESTCASE_6I(desc, name, 132); \
- DO_TESTCASE_6I(desc, name, 213); \
- DO_TESTCASE_6I(desc, name, 231); \
- DO_TESTCASE_6I(desc, name, 312); \
- DO_TESTCASE_6I(desc, name, 321);
- #define DO_TESTCASE_6x6RW(desc, name) \
- DO_TESTCASE_6IRW(desc, name, 123); \
- DO_TESTCASE_6IRW(desc, name, 132); \
- DO_TESTCASE_6IRW(desc, name, 213); \
- DO_TESTCASE_6IRW(desc, name, 231); \
- DO_TESTCASE_6IRW(desc, name, 312); \
- DO_TESTCASE_6IRW(desc, name, 321);
- static void ww_test_fail_acquire(void)
- {
- int ret;
- WWAI(&t);
- t.stamp++;
- ret = WWL(&o, &t);
- if (WARN_ON(!o.ctx) ||
- WARN_ON(ret))
- return;
- /* No lockdep test, pure API */
- ret = WWL(&o, &t);
- WARN_ON(ret != -EALREADY);
- ret = WWT(&o);
- WARN_ON(ret);
- t2 = t;
- t2.stamp++;
- ret = WWL(&o, &t2);
- WARN_ON(ret != -EDEADLK);
- WWU(&o);
- if (WWT(&o))
- WWU(&o);
- #ifdef CONFIG_DEBUG_LOCK_ALLOC
- else
- DEBUG_LOCKS_WARN_ON(1);
- #endif
- }
- #ifdef CONFIG_PREEMPT_RT
- #define ww_mutex_base_lock(b) rt_mutex_lock(b)
- #define ww_mutex_base_trylock(b) rt_mutex_trylock(b)
- #define ww_mutex_base_lock_nest_lock(b, b2) rt_mutex_lock_nest_lock(b, b2)
- #define ww_mutex_base_lock_interruptible(b) rt_mutex_lock_interruptible(b)
- #define ww_mutex_base_lock_killable(b) rt_mutex_lock_killable(b)
- #define ww_mutex_base_unlock(b) rt_mutex_unlock(b)
- #else
- #define ww_mutex_base_lock(b) mutex_lock(b)
- #define ww_mutex_base_trylock(b) mutex_trylock(b)
- #define ww_mutex_base_lock_nest_lock(b, b2) mutex_lock_nest_lock(b, b2)
- #define ww_mutex_base_lock_interruptible(b) mutex_lock_interruptible(b)
- #define ww_mutex_base_lock_killable(b) mutex_lock_killable(b)
- #define ww_mutex_base_unlock(b) mutex_unlock(b)
- #endif
- static void ww_test_normal(void)
- {
- int ret;
- WWAI(&t);
- /*
- * None of the ww_mutex codepaths should be taken in the 'normal'
- * mutex calls. The easiest way to verify this is by using the
- * normal mutex calls, and making sure o.ctx is unmodified.
- */
- /* mutex_lock (and indirectly, mutex_lock_nested) */
- o.ctx = (void *)~0UL;
- ww_mutex_base_lock(&o.base);
- ww_mutex_base_unlock(&o.base);
- WARN_ON(o.ctx != (void *)~0UL);
- /* mutex_lock_interruptible (and *_nested) */
- o.ctx = (void *)~0UL;
- ret = ww_mutex_base_lock_interruptible(&o.base);
- if (!ret)
- ww_mutex_base_unlock(&o.base);
- else
- WARN_ON(1);
- WARN_ON(o.ctx != (void *)~0UL);
- /* mutex_lock_killable (and *_nested) */
- o.ctx = (void *)~0UL;
- ret = ww_mutex_base_lock_killable(&o.base);
- if (!ret)
- ww_mutex_base_unlock(&o.base);
- else
- WARN_ON(1);
- WARN_ON(o.ctx != (void *)~0UL);
- /* trylock, succeeding */
- o.ctx = (void *)~0UL;
- ret = ww_mutex_base_trylock(&o.base);
- WARN_ON(!ret);
- if (ret)
- ww_mutex_base_unlock(&o.base);
- else
- WARN_ON(1);
- WARN_ON(o.ctx != (void *)~0UL);
- /* trylock, failing */
- o.ctx = (void *)~0UL;
- ww_mutex_base_lock(&o.base);
- ret = ww_mutex_base_trylock(&o.base);
- WARN_ON(ret);
- ww_mutex_base_unlock(&o.base);
- WARN_ON(o.ctx != (void *)~0UL);
- /* nest_lock */
- o.ctx = (void *)~0UL;
- ww_mutex_base_lock_nest_lock(&o.base, &t);
- ww_mutex_base_unlock(&o.base);
- WARN_ON(o.ctx != (void *)~0UL);
- }
- static void ww_test_two_contexts(void)
- {
- WWAI(&t);
- WWAI(&t2);
- }
- static void ww_test_diff_class(void)
- {
- WWAI(&t);
- #ifdef DEBUG_WW_MUTEXES
- t.ww_class = NULL;
- #endif
- WWL(&o, &t);
- }
- static void ww_test_context_done_twice(void)
- {
- WWAI(&t);
- WWAD(&t);
- WWAD(&t);
- WWAF(&t);
- }
- static void ww_test_context_unlock_twice(void)
- {
- WWAI(&t);
- WWAD(&t);
- WWAF(&t);
- WWAF(&t);
- }
- static void ww_test_context_fini_early(void)
- {
- WWAI(&t);
- WWL(&o, &t);
- WWAD(&t);
- WWAF(&t);
- }
- static void ww_test_context_lock_after_done(void)
- {
- WWAI(&t);
- WWAD(&t);
- WWL(&o, &t);
- }
- static void ww_test_object_unlock_twice(void)
- {
- WWL1(&o);
- WWU(&o);
- WWU(&o);
- }
- static void ww_test_object_lock_unbalanced(void)
- {
- WWAI(&t);
- WWL(&o, &t);
- t.acquired = 0;
- WWU(&o);
- WWAF(&t);
- }
- static void ww_test_object_lock_stale_context(void)
- {
- WWAI(&t);
- o.ctx = &t2;
- WWL(&o, &t);
- }
- static void ww_test_edeadlk_normal(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- o2.ctx = &t2;
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- o2.ctx = NULL;
- mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
- ww_mutex_base_unlock(&o2.base);
- WWU(&o);
- WWL(&o2, &t);
- }
- static void ww_test_edeadlk_normal_slow(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- o2.ctx = NULL;
- mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
- ww_mutex_base_unlock(&o2.base);
- WWU(&o);
- ww_mutex_lock_slow(&o2, &t);
- }
- static void ww_test_edeadlk_no_unlock(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- o2.ctx = &t2;
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- o2.ctx = NULL;
- mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
- ww_mutex_base_unlock(&o2.base);
- WWL(&o2, &t);
- }
- static void ww_test_edeadlk_no_unlock_slow(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- o2.ctx = NULL;
- mutex_acquire(&o2.base.dep_map, 0, 1, _THIS_IP_);
- ww_mutex_base_unlock(&o2.base);
- ww_mutex_lock_slow(&o2, &t);
- }
- static void ww_test_edeadlk_acquire_more(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- ret = WWL(&o3, &t);
- }
- static void ww_test_edeadlk_acquire_more_slow(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- ww_mutex_lock_slow(&o3, &t);
- }
- static void ww_test_edeadlk_acquire_more_edeadlk(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- ww_mutex_base_lock(&o3.base);
- mutex_release(&o3.base.dep_map, _THIS_IP_);
- o3.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- ret = WWL(&o3, &t);
- WARN_ON(ret != -EDEADLK);
- }
- static void ww_test_edeadlk_acquire_more_edeadlk_slow(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- ww_mutex_base_lock(&o3.base);
- mutex_release(&o3.base.dep_map, _THIS_IP_);
- o3.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- ww_mutex_lock_slow(&o3, &t);
- }
- static void ww_test_edeadlk_acquire_wrong(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- if (!ret)
- WWU(&o2);
- WWU(&o);
- ret = WWL(&o3, &t);
- }
- static void ww_test_edeadlk_acquire_wrong_slow(void)
- {
- int ret;
- ww_mutex_base_lock(&o2.base);
- mutex_release(&o2.base.dep_map, _THIS_IP_);
- o2.ctx = &t2;
- WWAI(&t);
- t2 = t;
- t2.stamp--;
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret != -EDEADLK);
- if (!ret)
- WWU(&o2);
- WWU(&o);
- ww_mutex_lock_slow(&o3, &t);
- }
- static void ww_test_spin_nest_unlocked(void)
- {
- spin_lock_nest_lock(&lock_A, &o.base);
- U(A);
- }
- /* This is not a deadlock, because we have X1 to serialize Y1 and Y2 */
- static void ww_test_spin_nest_lock(void)
- {
- spin_lock(&lock_X1);
- spin_lock_nest_lock(&lock_Y1, &lock_X1);
- spin_lock(&lock_A);
- spin_lock_nest_lock(&lock_Y2, &lock_X1);
- spin_unlock(&lock_A);
- spin_unlock(&lock_Y2);
- spin_unlock(&lock_Y1);
- spin_unlock(&lock_X1);
- }
- static void ww_test_unneeded_slow(void)
- {
- WWAI(&t);
- ww_mutex_lock_slow(&o, &t);
- }
- static void ww_test_context_block(void)
- {
- int ret;
- WWAI(&t);
- ret = WWL(&o, &t);
- WARN_ON(ret);
- WWL1(&o2);
- }
- static void ww_test_context_try(void)
- {
- int ret;
- WWAI(&t);
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWT(&o2);
- WARN_ON(!ret);
- WWU(&o2);
- WWU(&o);
- }
- static void ww_test_context_context(void)
- {
- int ret;
- WWAI(&t);
- ret = WWL(&o, &t);
- WARN_ON(ret);
- ret = WWL(&o2, &t);
- WARN_ON(ret);
- WWU(&o2);
- WWU(&o);
- }
- static void ww_test_try_block(void)
- {
- bool ret;
- ret = WWT(&o);
- WARN_ON(!ret);
- WWL1(&o2);
- WWU(&o2);
- WWU(&o);
- }
- static void ww_test_try_try(void)
- {
- bool ret;
- ret = WWT(&o);
- WARN_ON(!ret);
- ret = WWT(&o2);
- WARN_ON(!ret);
- WWU(&o2);
- WWU(&o);
- }
- static void ww_test_try_context(void)
- {
- int ret;
- ret = WWT(&o);
- WARN_ON(!ret);
- WWAI(&t);
- ret = WWL(&o2, &t);
- WARN_ON(ret);
- }
- static void ww_test_block_block(void)
- {
- WWL1(&o);
- WWL1(&o2);
- }
- static void ww_test_block_try(void)
- {
- bool ret;
- WWL1(&o);
- ret = WWT(&o2);
- WARN_ON(!ret);
- }
- static void ww_test_block_context(void)
- {
- int ret;
- WWL1(&o);
- WWAI(&t);
- ret = WWL(&o2, &t);
- WARN_ON(ret);
- }
- static void ww_test_spin_block(void)
- {
- L(A);
- U(A);
- WWL1(&o);
- L(A);
- U(A);
- WWU(&o);
- L(A);
- WWL1(&o);
- WWU(&o);
- U(A);
- }
- static void ww_test_spin_try(void)
- {
- bool ret;
- L(A);
- U(A);
- ret = WWT(&o);
- WARN_ON(!ret);
- L(A);
- U(A);
- WWU(&o);
- L(A);
- ret = WWT(&o);
- WARN_ON(!ret);
- WWU(&o);
- U(A);
- }
- static void ww_test_spin_context(void)
- {
- int ret;
- L(A);
- U(A);
- WWAI(&t);
- ret = WWL(&o, &t);
- WARN_ON(ret);
- L(A);
- U(A);
- WWU(&o);
- L(A);
- ret = WWL(&o, &t);
- WARN_ON(ret);
- WWU(&o);
- U(A);
- }
- static void ww_tests(void)
- {
- printk(" --------------------------------------------------------------------------\n");
- printk(" | Wound/wait tests |\n");
- printk(" ---------------------\n");
- print_testname("ww api failures");
- dotest(ww_test_fail_acquire, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_normal, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_unneeded_slow, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("ww contexts mixing");
- dotest(ww_test_two_contexts, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_diff_class, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("finishing ww context");
- dotest(ww_test_context_done_twice, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_context_unlock_twice, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_context_fini_early, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_context_lock_after_done, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("locking mismatches");
- dotest(ww_test_object_unlock_twice, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_object_lock_unbalanced, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_object_lock_stale_context, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("EDEADLK handling");
- dotest(ww_test_edeadlk_normal, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_normal_slow, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_no_unlock, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_no_unlock_slow, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_acquire_more, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_acquire_more_slow, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_acquire_more_edeadlk, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_acquire_more_edeadlk_slow, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_acquire_wrong, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_edeadlk_acquire_wrong_slow, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("spinlock nest unlocked");
- dotest(ww_test_spin_nest_unlocked, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("spinlock nest test");
- dotest(ww_test_spin_nest_lock, SUCCESS, LOCKTYPE_WW);
- pr_cont("\n");
- printk(" -----------------------------------------------------\n");
- printk(" |block | try |context|\n");
- printk(" -----------------------------------------------------\n");
- print_testname("context");
- dotest(ww_test_context_block, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_context_try, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_context_context, SUCCESS, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("try");
- dotest(ww_test_try_block, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_try_try, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_try_context, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("block");
- dotest(ww_test_block_block, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_block_try, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_block_context, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- print_testname("spinlock");
- dotest(ww_test_spin_block, FAILURE, LOCKTYPE_WW);
- dotest(ww_test_spin_try, SUCCESS, LOCKTYPE_WW);
- dotest(ww_test_spin_context, FAILURE, LOCKTYPE_WW);
- pr_cont("\n");
- }
- /*
- * <in hardirq handler>
- * read_lock(&A);
- * <hardirq disable>
- * spin_lock(&B);
- * spin_lock(&B);
- * read_lock(&A);
- *
- * is a deadlock.
- */
- static void queued_read_lock_hardirq_RE_Er(void)
- {
- HARDIRQ_ENTER();
- read_lock(&rwlock_A);
- LOCK(B);
- UNLOCK(B);
- read_unlock(&rwlock_A);
- HARDIRQ_EXIT();
- HARDIRQ_DISABLE();
- LOCK(B);
- read_lock(&rwlock_A);
- read_unlock(&rwlock_A);
- UNLOCK(B);
- HARDIRQ_ENABLE();
- }
- /*
- * <in hardirq handler>
- * spin_lock(&B);
- * <hardirq disable>
- * read_lock(&A);
- * read_lock(&A);
- * spin_lock(&B);
- *
- * is not a deadlock.
- */
- static void queued_read_lock_hardirq_ER_rE(void)
- {
- HARDIRQ_ENTER();
- LOCK(B);
- read_lock(&rwlock_A);
- read_unlock(&rwlock_A);
- UNLOCK(B);
- HARDIRQ_EXIT();
- HARDIRQ_DISABLE();
- read_lock(&rwlock_A);
- LOCK(B);
- UNLOCK(B);
- read_unlock(&rwlock_A);
- HARDIRQ_ENABLE();
- }
- /*
- * <hardirq disable>
- * spin_lock(&B);
- * read_lock(&A);
- * <in hardirq handler>
- * spin_lock(&B);
- * read_lock(&A);
- *
- * is a deadlock. Because the two read_lock()s are both non-recursive readers.
- */
- static void queued_read_lock_hardirq_inversion(void)
- {
- HARDIRQ_ENTER();
- LOCK(B);
- UNLOCK(B);
- HARDIRQ_EXIT();
- HARDIRQ_DISABLE();
- LOCK(B);
- read_lock(&rwlock_A);
- read_unlock(&rwlock_A);
- UNLOCK(B);
- HARDIRQ_ENABLE();
- read_lock(&rwlock_A);
- read_unlock(&rwlock_A);
- }
- static void queued_read_lock_tests(void)
- {
- printk(" --------------------------------------------------------------------------\n");
- printk(" | queued read lock tests |\n");
- printk(" ---------------------------\n");
- print_testname("hardirq read-lock/lock-read");
- dotest(queued_read_lock_hardirq_RE_Er, FAILURE, LOCKTYPE_RWLOCK);
- pr_cont("\n");
- print_testname("hardirq lock-read/read-lock");
- dotest(queued_read_lock_hardirq_ER_rE, SUCCESS, LOCKTYPE_RWLOCK);
- pr_cont("\n");
- print_testname("hardirq inversion");
- dotest(queued_read_lock_hardirq_inversion, FAILURE, LOCKTYPE_RWLOCK);
- pr_cont("\n");
- }
- static void fs_reclaim_correct_nesting(void)
- {
- fs_reclaim_acquire(GFP_KERNEL);
- might_alloc(GFP_NOFS);
- fs_reclaim_release(GFP_KERNEL);
- }
- static void fs_reclaim_wrong_nesting(void)
- {
- fs_reclaim_acquire(GFP_KERNEL);
- might_alloc(GFP_KERNEL);
- fs_reclaim_release(GFP_KERNEL);
- }
- static void fs_reclaim_protected_nesting(void)
- {
- unsigned int flags;
- fs_reclaim_acquire(GFP_KERNEL);
- flags = memalloc_nofs_save();
- might_alloc(GFP_KERNEL);
- memalloc_nofs_restore(flags);
- fs_reclaim_release(GFP_KERNEL);
- }
- static void fs_reclaim_tests(void)
- {
- printk(" --------------------\n");
- printk(" | fs_reclaim tests |\n");
- printk(" --------------------\n");
- print_testname("correct nesting");
- dotest(fs_reclaim_correct_nesting, SUCCESS, 0);
- pr_cont("\n");
- print_testname("wrong nesting");
- dotest(fs_reclaim_wrong_nesting, FAILURE, 0);
- pr_cont("\n");
- print_testname("protected nesting");
- dotest(fs_reclaim_protected_nesting, SUCCESS, 0);
- pr_cont("\n");
- }
- #define __guard(cleanup) __maybe_unused __attribute__((__cleanup__(cleanup)))
- static void hardirq_exit(int *_)
- {
- HARDIRQ_EXIT();
- }
- #define HARDIRQ_CONTEXT(name, ...) \
- int hardirq_guard_##name __guard(hardirq_exit); \
- HARDIRQ_ENTER();
- #define NOTTHREADED_HARDIRQ_CONTEXT(name, ...) \
- int notthreaded_hardirq_guard_##name __guard(hardirq_exit); \
- local_irq_disable(); \
- __irq_enter(); \
- WARN_ON(!in_irq());
- static void softirq_exit(int *_)
- {
- SOFTIRQ_EXIT();
- }
- #define SOFTIRQ_CONTEXT(name, ...) \
- int softirq_guard_##name __guard(softirq_exit); \
- SOFTIRQ_ENTER();
- static void rcu_exit(int *_)
- {
- rcu_read_unlock();
- }
- #define RCU_CONTEXT(name, ...) \
- int rcu_guard_##name __guard(rcu_exit); \
- rcu_read_lock();
- static void rcu_bh_exit(int *_)
- {
- rcu_read_unlock_bh();
- }
- #define RCU_BH_CONTEXT(name, ...) \
- int rcu_bh_guard_##name __guard(rcu_bh_exit); \
- rcu_read_lock_bh();
- static void rcu_sched_exit(int *_)
- {
- rcu_read_unlock_sched();
- }
- #define RCU_SCHED_CONTEXT(name, ...) \
- int rcu_sched_guard_##name __guard(rcu_sched_exit); \
- rcu_read_lock_sched();
- static void raw_spinlock_exit(raw_spinlock_t **lock)
- {
- raw_spin_unlock(*lock);
- }
- #define RAW_SPINLOCK_CONTEXT(name, lock) \
- raw_spinlock_t *raw_spinlock_guard_##name __guard(raw_spinlock_exit) = &(lock); \
- raw_spin_lock(&(lock));
- static void spinlock_exit(spinlock_t **lock)
- {
- spin_unlock(*lock);
- }
- #define SPINLOCK_CONTEXT(name, lock) \
- spinlock_t *spinlock_guard_##name __guard(spinlock_exit) = &(lock); \
- spin_lock(&(lock));
- static void mutex_exit(struct mutex **lock)
- {
- mutex_unlock(*lock);
- }
- #define MUTEX_CONTEXT(name, lock) \
- struct mutex *mutex_guard_##name __guard(mutex_exit) = &(lock); \
- mutex_lock(&(lock));
- #define GENERATE_2_CONTEXT_TESTCASE(outer, outer_lock, inner, inner_lock) \
- \
- static void __maybe_unused inner##_in_##outer(void) \
- { \
- outer##_CONTEXT(_, outer_lock); \
- { \
- inner##_CONTEXT(_, inner_lock); \
- } \
- }
- /*
- * wait contexts (considering PREEMPT_RT)
- *
- * o: inner is allowed in outer
- * x: inner is disallowed in outer
- *
- * \ inner | RCU | RAW_SPIN | SPIN | MUTEX
- * outer \ | | | |
- * ---------------+-------+----------+------+-------
- * HARDIRQ | o | o | o | x
- * ---------------+-------+----------+------+-------
- * NOTTHREADED_IRQ| o | o | x | x
- * ---------------+-------+----------+------+-------
- * SOFTIRQ | o | o | o | x
- * ---------------+-------+----------+------+-------
- * RCU | o | o | o | x
- * ---------------+-------+----------+------+-------
- * RCU_BH | o | o | o | x
- * ---------------+-------+----------+------+-------
- * RCU_SCHED | o | o | x | x
- * ---------------+-------+----------+------+-------
- * RAW_SPIN | o | o | x | x
- * ---------------+-------+----------+------+-------
- * SPIN | o | o | o | x
- * ---------------+-------+----------+------+-------
- * MUTEX | o | o | o | o
- * ---------------+-------+----------+------+-------
- */
- #define GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(HARDIRQ, , inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(NOTTHREADED_HARDIRQ, , inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(SOFTIRQ, , inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(RCU, , inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(RCU_BH, , inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(RCU_SCHED, , inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(RAW_SPINLOCK, raw_lock_A, inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(SPINLOCK, lock_A, inner, inner_lock) \
- GENERATE_2_CONTEXT_TESTCASE(MUTEX, mutex_A, inner, inner_lock)
- GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RCU, )
- GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(RAW_SPINLOCK, raw_lock_B)
- GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(SPINLOCK, lock_B)
- GENERATE_2_CONTEXT_TESTCASE_FOR_ALL_OUTER(MUTEX, mutex_B)
- /* the outer context allows all kinds of preemption */
- #define DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(outer) \
- dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
- dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
- dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
- dotest(MUTEX_in_##outer, SUCCESS, LOCKTYPE_MUTEX); \
- /*
- * the outer context only allows the preemption introduced by spinlock_t (which
- * is a sleepable lock for PREEMPT_RT)
- */
- #define DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(outer) \
- dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
- dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
- dotest(SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
- dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
- /* the outer doesn't allows any kind of preemption */
- #define DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(outer) \
- dotest(RCU_in_##outer, SUCCESS, LOCKTYPE_RWLOCK); \
- dotest(RAW_SPINLOCK_in_##outer, SUCCESS, LOCKTYPE_SPIN); \
- dotest(SPINLOCK_in_##outer, FAILURE, LOCKTYPE_SPIN); \
- dotest(MUTEX_in_##outer, FAILURE, LOCKTYPE_MUTEX); \
- static void wait_context_tests(void)
- {
- printk(" --------------------------------------------------------------------------\n");
- printk(" | wait context tests |\n");
- printk(" --------------------------------------------------------------------------\n");
- printk(" | rcu | raw | spin |mutex |\n");
- printk(" --------------------------------------------------------------------------\n");
- print_testname("in hardirq context");
- DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(HARDIRQ);
- pr_cont("\n");
- print_testname("in hardirq context (not threaded)");
- DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(NOTTHREADED_HARDIRQ);
- pr_cont("\n");
- print_testname("in softirq context");
- DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SOFTIRQ);
- pr_cont("\n");
- print_testname("in RCU context");
- DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU);
- pr_cont("\n");
- print_testname("in RCU-bh context");
- DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(RCU_BH);
- pr_cont("\n");
- print_testname("in RCU-sched context");
- DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RCU_SCHED);
- pr_cont("\n");
- print_testname("in RAW_SPINLOCK context");
- DO_CONTEXT_TESTCASE_OUTER_NOT_PREEMPTIBLE(RAW_SPINLOCK);
- pr_cont("\n");
- print_testname("in SPINLOCK context");
- DO_CONTEXT_TESTCASE_OUTER_LIMITED_PREEMPTIBLE(SPINLOCK);
- pr_cont("\n");
- print_testname("in MUTEX context");
- DO_CONTEXT_TESTCASE_OUTER_PREEMPTIBLE(MUTEX);
- pr_cont("\n");
- }
- static void local_lock_2(void)
- {
- local_lock(&local_A); /* IRQ-ON */
- local_unlock(&local_A);
- HARDIRQ_ENTER();
- spin_lock(&lock_A); /* IN-IRQ */
- spin_unlock(&lock_A);
- HARDIRQ_EXIT()
- HARDIRQ_DISABLE();
- spin_lock(&lock_A);
- local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle, false */
- local_unlock(&local_A);
- spin_unlock(&lock_A);
- HARDIRQ_ENABLE();
- }
- static void local_lock_3A(void)
- {
- local_lock(&local_A); /* IRQ-ON */
- spin_lock(&lock_B); /* IRQ-ON */
- spin_unlock(&lock_B);
- local_unlock(&local_A);
- HARDIRQ_ENTER();
- spin_lock(&lock_A); /* IN-IRQ */
- spin_unlock(&lock_A);
- HARDIRQ_EXIT()
- HARDIRQ_DISABLE();
- spin_lock(&lock_A);
- local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
- local_unlock(&local_A);
- spin_unlock(&lock_A);
- HARDIRQ_ENABLE();
- }
- static void local_lock_3B(void)
- {
- local_lock(&local_A); /* IRQ-ON */
- spin_lock(&lock_B); /* IRQ-ON */
- spin_unlock(&lock_B);
- local_unlock(&local_A);
- HARDIRQ_ENTER();
- spin_lock(&lock_A); /* IN-IRQ */
- spin_unlock(&lock_A);
- HARDIRQ_EXIT()
- HARDIRQ_DISABLE();
- spin_lock(&lock_A);
- local_lock(&local_A); /* IN-IRQ <-> IRQ-ON cycle only if we count local_lock(), false */
- local_unlock(&local_A);
- spin_unlock(&lock_A);
- HARDIRQ_ENABLE();
- HARDIRQ_DISABLE();
- spin_lock(&lock_A);
- spin_lock(&lock_B); /* IN-IRQ <-> IRQ-ON cycle, true */
- spin_unlock(&lock_B);
- spin_unlock(&lock_A);
- HARDIRQ_DISABLE();
- }
- static void local_lock_tests(void)
- {
- printk(" --------------------------------------------------------------------------\n");
- printk(" | local_lock tests |\n");
- printk(" ---------------------\n");
- print_testname("local_lock inversion 2");
- dotest(local_lock_2, SUCCESS, LOCKTYPE_LL);
- pr_cont("\n");
- print_testname("local_lock inversion 3A");
- dotest(local_lock_3A, SUCCESS, LOCKTYPE_LL);
- pr_cont("\n");
- print_testname("local_lock inversion 3B");
- dotest(local_lock_3B, FAILURE, LOCKTYPE_LL);
- pr_cont("\n");
- }
- static void hardirq_deadlock_softirq_not_deadlock(void)
- {
- /* mutex_A is hardirq-unsafe and softirq-unsafe */
- /* mutex_A -> lock_C */
- mutex_lock(&mutex_A);
- HARDIRQ_DISABLE();
- spin_lock(&lock_C);
- spin_unlock(&lock_C);
- HARDIRQ_ENABLE();
- mutex_unlock(&mutex_A);
- /* lock_A is hardirq-safe */
- HARDIRQ_ENTER();
- spin_lock(&lock_A);
- spin_unlock(&lock_A);
- HARDIRQ_EXIT();
- /* lock_A -> lock_B */
- HARDIRQ_DISABLE();
- spin_lock(&lock_A);
- spin_lock(&lock_B);
- spin_unlock(&lock_B);
- spin_unlock(&lock_A);
- HARDIRQ_ENABLE();
- /* lock_B -> lock_C */
- HARDIRQ_DISABLE();
- spin_lock(&lock_B);
- spin_lock(&lock_C);
- spin_unlock(&lock_C);
- spin_unlock(&lock_B);
- HARDIRQ_ENABLE();
- /* lock_D is softirq-safe */
- SOFTIRQ_ENTER();
- spin_lock(&lock_D);
- spin_unlock(&lock_D);
- SOFTIRQ_EXIT();
- /* And lock_D is hardirq-unsafe */
- SOFTIRQ_DISABLE();
- spin_lock(&lock_D);
- spin_unlock(&lock_D);
- SOFTIRQ_ENABLE();
- /*
- * mutex_A -> lock_C -> lock_D is softirq-unsafe -> softirq-safe, not
- * deadlock.
- *
- * lock_A -> lock_B -> lock_C -> lock_D is hardirq-safe ->
- * hardirq-unsafe, deadlock.
- */
- HARDIRQ_DISABLE();
- spin_lock(&lock_C);
- spin_lock(&lock_D);
- spin_unlock(&lock_D);
- spin_unlock(&lock_C);
- HARDIRQ_ENABLE();
- }
- void locking_selftest(void)
- {
- /*
- * Got a locking failure before the selftest ran?
- */
- if (!debug_locks) {
- printk("----------------------------------\n");
- printk("| Locking API testsuite disabled |\n");
- printk("----------------------------------\n");
- return;
- }
- /*
- * treats read_lock() as recursive read locks for testing purpose
- */
- force_read_lock_recursive = 1;
- /*
- * Run the testsuite:
- */
- printk("------------------------\n");
- printk("| Locking API testsuite:\n");
- printk("----------------------------------------------------------------------------\n");
- printk(" | spin |wlock |rlock |mutex | wsem | rsem |rtmutex\n");
- printk(" --------------------------------------------------------------------------\n");
- init_shared_classes();
- lockdep_set_selftest_task(current);
- DO_TESTCASE_6R("A-A deadlock", AA);
- DO_TESTCASE_6R("A-B-B-A deadlock", ABBA);
- DO_TESTCASE_6R("A-B-B-C-C-A deadlock", ABBCCA);
- DO_TESTCASE_6R("A-B-C-A-B-C deadlock", ABCABC);
- DO_TESTCASE_6R("A-B-B-C-C-D-D-A deadlock", ABBCCDDA);
- DO_TESTCASE_6R("A-B-C-D-B-D-D-A deadlock", ABCDBDDA);
- DO_TESTCASE_6R("A-B-C-D-B-C-D-A deadlock", ABCDBCDA);
- DO_TESTCASE_6("double unlock", double_unlock);
- DO_TESTCASE_6("initialize held", init_held);
- printk(" --------------------------------------------------------------------------\n");
- print_testname("recursive read-lock");
- pr_cont(" |");
- dotest(rlock_AA1, SUCCESS, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rsem_AA1, FAILURE, LOCKTYPE_RWSEM);
- pr_cont("\n");
- print_testname("recursive read-lock #2");
- pr_cont(" |");
- dotest(rlock_AA1B, SUCCESS, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rsem_AA1B, FAILURE, LOCKTYPE_RWSEM);
- pr_cont("\n");
- print_testname("mixed read-write-lock");
- pr_cont(" |");
- dotest(rlock_AA2, FAILURE, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rsem_AA2, FAILURE, LOCKTYPE_RWSEM);
- pr_cont("\n");
- print_testname("mixed write-read-lock");
- pr_cont(" |");
- dotest(rlock_AA3, FAILURE, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rsem_AA3, FAILURE, LOCKTYPE_RWSEM);
- pr_cont("\n");
- print_testname("mixed read-lock/lock-write ABBA");
- pr_cont(" |");
- dotest(rlock_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rwsem_ABBA1, FAILURE, LOCKTYPE_RWSEM);
- print_testname("mixed read-lock/lock-read ABBA");
- pr_cont(" |");
- dotest(rlock_ABBA2, SUCCESS, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rwsem_ABBA2, FAILURE, LOCKTYPE_RWSEM);
- print_testname("mixed write-lock/lock-write ABBA");
- pr_cont(" |");
- dotest(rlock_ABBA3, FAILURE, LOCKTYPE_RWLOCK);
- pr_cont(" |");
- dotest(rwsem_ABBA3, FAILURE, LOCKTYPE_RWSEM);
- print_testname("chain cached mixed R-L/L-W ABBA");
- pr_cont(" |");
- dotest(rlock_chaincache_ABBA1, FAILURE, LOCKTYPE_RWLOCK);
- DO_TESTCASE_6x1RRB("rlock W1R2/W2R3/W3R1", W1R2_W2R3_W3R1);
- DO_TESTCASE_6x1RRB("rlock W1W2/R2R3/W3R1", W1W2_R2R3_W3R1);
- DO_TESTCASE_6x1RR("rlock W1W2/R2R3/R3W1", W1W2_R2R3_R3W1);
- DO_TESTCASE_6x1RR("rlock W1R2/R2R3/W3W1", W1R2_R2R3_W3W1);
- printk(" --------------------------------------------------------------------------\n");
- /*
- * irq-context testcases:
- */
- DO_TESTCASE_2x6("irqs-on + irq-safe-A", irqsafe1);
- NON_RT(DO_TESTCASE_2x3("sirq-safe-A => hirqs-on", irqsafe2A));
- DO_TESTCASE_2x6("safe-A + irqs-on", irqsafe2B);
- DO_TESTCASE_6x6("safe-A + unsafe-B #1", irqsafe3);
- DO_TESTCASE_6x6("safe-A + unsafe-B #2", irqsafe4);
- DO_TESTCASE_6x6RW("irq lock-inversion", irq_inversion);
- DO_TESTCASE_6x2x2RW("irq read-recursion", irq_read_recursion);
- DO_TESTCASE_6x2x2RW("irq read-recursion #2", irq_read_recursion2);
- DO_TESTCASE_6x2x2RW("irq read-recursion #3", irq_read_recursion3);
- ww_tests();
- force_read_lock_recursive = 0;
- /*
- * queued_read_lock() specific test cases can be put here
- */
- if (IS_ENABLED(CONFIG_QUEUED_RWLOCKS))
- queued_read_lock_tests();
- fs_reclaim_tests();
- /* Wait context test cases that are specific for RAW_LOCK_NESTING */
- if (IS_ENABLED(CONFIG_PROVE_RAW_LOCK_NESTING))
- wait_context_tests();
- local_lock_tests();
- print_testname("hardirq_unsafe_softirq_safe");
- dotest(hardirq_deadlock_softirq_not_deadlock, FAILURE, LOCKTYPE_SPECIAL);
- pr_cont("\n");
- if (unexpected_testcase_failures) {
- printk("-----------------------------------------------------------------\n");
- debug_locks = 0;
- printk("BUG: %3d unexpected failures (out of %3d) - debugging disabled! |\n",
- unexpected_testcase_failures, testcase_total);
- printk("-----------------------------------------------------------------\n");
- } else if (expected_testcase_failures && testcase_successes) {
- printk("--------------------------------------------------------\n");
- printk("%3d out of %3d testcases failed, as expected. |\n",
- expected_testcase_failures, testcase_total);
- printk("----------------------------------------------------\n");
- debug_locks = 1;
- } else if (expected_testcase_failures && !testcase_successes) {
- printk("--------------------------------------------------------\n");
- printk("All %3d testcases failed, as expected. |\n",
- expected_testcase_failures);
- printk("----------------------------------------\n");
- debug_locks = 1;
- } else {
- printk("-------------------------------------------------------\n");
- printk("Good, all %3d testcases passed! |\n",
- testcase_successes);
- printk("---------------------------------\n");
- debug_locks = 1;
- }
- lockdep_set_selftest_task(NULL);
- debug_locks_silent = 0;
- }
|